I am trying to upgrade here, below is my error log. Any suggestions?

02:00:49: Running User Interface Version 11.2.20112.1000

02:00:49: Gathering volume and assembly information.

02:01:09: Analyzing Intranet.csproj...

02:01:09: The project has references that need to be updated.

02:01:38: Gathering volume and assembly information.

02:01:40: Analyzing Intranet.csproj...

02:01:40: The project has references that need to be updated.

02:01:43: C:\TestIntranet\Intranet\Intranet\web.config has been backed up.

02:01:43: Replacement for Infragistics4.WebUI.Shared.v11.2 is Infragistics4.WebUI.Shared.v11.2.

02:01:43: C:\TestIntranet\Intranet\Intranet\obj\Release\TransformWebConfig\transformed\Web.config has been backed up.

02:01:43: No matching assembly located in available assemblies Infragistics35.WebUI.UltraWebGrid.v8.1

02:01:43:    at Infragistics.VersionUtilitySupport.Core.ProductAssemblies.AssemblyXmlFile.GetNewAssemblyNameBecauseOfNameChangedBetweenVolumes(String assemblyName, Int32 indexOfVolumePortionOfAssemblyName, XmlNamespaceManager xmlNamespaceManager, Boolean ignoreErrors)

   at Infragistics.VersionUtilitySupport.Core.ProductAssemblies.AssemblyXmlFile.LocateNewAssembliesNodeforCurrentAssembly(String assemblyName)

   at Infragistics.VersionUtilitySupport.Core.File.Types.WebConfigFile.FixAssembly(XmlNode n)

   at Infragistics.VersionUtilitySupport.Core.File.Types.WebConfigFile.UpgradeInfragisticsAssemblyTags()

   at Infragistics.VersionUtilitySupport.Core.File.Types.WebConfigFile.Upgrade(String rootDirectory)

   at Infragistics.VersionUtilitySupport.Core.File.Types.FileBasewithWebConfig.Upgrade(String rootDirectory)

   at Infragistics.VersionUtilitySupport.Core.File.Types.ProjectFile.Upgrade(String rootDirectory)